<?php

/**
 * Define how to create SQL WHERE clauses.
 *
 */
interface Junction_Clause {
	
	/**
	 * @return String
	 */
	public function toSql();
	
	/**
	 * @return array
	 */
	public function getParameters();
	
	/**
	 * @return String
	 */
	public function __toString();
}
?>